PSD w/P0107code Causes E4OD Hard Shifts

[Mike Genius]

I Have a 1997 F-series 4x4 w/PowerStroke 7.3 turbo and an E4OD auto trans. I can drive for a week without a problem. Out of no where it generates a DTC - P0107 Baro sensor low input. Then, just above idle speed it will shift 1-2 so hard it feels like the driveshaft's gonna snap! The 2-3 shift ain't much better, and when you shift into reverse, the torque converter appears to lock up, almost stalling the motor at idle! When I clear the code, it just returns. After a few days it will suddenly dissappear as fast as it appeared. I also need to know where the Barometric Pressure Sensor is located. If it's external on a 1997, then I need to know where it is located. If it's inside the PCM, I guess I'm screwed. Any help is greatly appreciated.

[ZachBoyer]

My truck started locking up in reverse and stalling right before my tranny went out

[gbear]

If you have a transmission code the overdrive light will flash. When you get a flashing overdrive light the computer boosts the line pressure and will cause the hard shifts. (real hard shifts like you described). When you kill the engine it will reset the line pressure and put out the overdrive light untill the problem occurs again. I am not sure how the baro Pressure could cause this. You may have missed a code relating to the transmission, or maybe you reader will not read them. I just don't know the answer.

Jim